SEGMENT REPORTING - Revenue, Expenses and Realized Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment revenues
Total revenues	$ 948,719	$ 489,866	$ 2,901,926	$ 1,106,033
Total segment revenues	509,142	428,307	1,428,143	1,184,162
Segment expenses
Compensation and benefits	335,569		837,108
General, administrative and other expenses	134,453		285,471
Total expenses	813,267	392,580	2,363,108	958,106
Segment other income
Total other income (expense)	111,536	62,355	218,011	(43,602)
Management fees
Segment revenues
Total revenues	448,262		1,135,821
Operating segment
Segment revenues
Performance income—realized	45,341	123,265	249,989	319,660
Segment expenses
Total performance related compensation—realized	33,728	97,538	185,306	252,575
Ares Management L.P
Segment revenues
Total revenues	948,719	489,866	2,901,926	1,106,033
Segment expenses
Compensation and benefits	335,569	194,267	837,108	559,482
General, administrative and other expenses	134,453	69,938	285,471	190,353
Ares Management L.P | Management fees
Segment revenues
Total revenues	448,262	292,434	1,135,821	823,150
Ares Management L.P | Operating segment
Segment revenues
Performance income—realized	45,341	123,265	249,989	319,660
Total segment revenues	509,142	428,307	1,428,143	1,184,162
Segment expenses
Compensation and benefits	159,706	112,849	418,768	327,409
General, administrative and other expenses	30,955	24,292	76,311	68,408
Total performance related compensation—realized	33,728	97,538	185,306	252,575
Total expenses	224,389	234,679	680,385	648,392
Segment other income
Investment income—realized	5,362	16,837	12,695	37,763
Interest and other investment income—realized	11,357	4,331	32,487	18,550
Interest expense	(11,363)	(6,674)	(24,728)	(16,941)
Total other income (expense)	5,356	14,494	20,454	39,372
Ares Management L.P | Operating segment | Management fees
Segment revenues
Total revenues	453,950	300,131	1,154,248	851,581
Ares Management L.P | Operating segment | Other fees
Segment revenues
Total revenues	$ 9,851	$ 4,911	$ 23,906	$ 12,921